I gave the Monty it's first oil change under my care, and went to Mobile 1 5w30. I've used Mobil 1 in other higher mileage vehicles (this has 160k) and had good results. I was pleased to see my oil pressure is much stronger, but now when I take off from the first few stop signs, before the engine is totally warmed up, I get a nice puff of blue smoke that I never did before with the used up dino oil. I'm not *too* concerned -- it goes away once the engine hits operating temp, but I'm a little uneasy it just started all the sudden after the oil change.